子比主题设置—>自定义代码—>自定义CSS代码,添加以下代码： /*手机侧边栏背景图片*/ @media (max-width: 767px){ .mobile-navbar.show,.mobile-navbar.left{ background-size: cover; background-repeat: no-repeat; background-position: center center; cursor: pointer; background-image:linear-gradient(rgba(255, 255,255,0),rgba(255,255,255, 0.3)),url(图片地址);} .mobile-nav-widget .box-body { background: var(--muted-border-color) !important;} }